Boost Control Circuit for Display Device Energy Reduction
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Solution Overview
Problem
High-definition liquid crystal displays consume excessive energy due to large output lines from driver IC chips, making it difficult to power portable devices for extended periods, and existing low-voltage liquid crystal materials are not cost-effective or efficient.
Innovation Solution
A display device with a matrix pattern of pixels, each comprising a display element and two capacitive elements connected in series, utilizing a boost control circuit with switches controlled by a gate signal to boost the electric potential, allowing for efficient energy use even with lower output voltages from the driver IC chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-definition liquid crystal display is implemented with large number of pixels, then display quality is improved, but energy consumption by driver IC chip increases markedly
Solution Approach 1:
The pixel circuit is divided into multiple functional blocks: a switching element controlled by a scanning line, a holding element, and a boosting element. This segmentation allows the circuit to perform voltage boosting operations independently, reducing the overall energy consumption while maintaining high-definition display capability through precise pixel control
Solution Approach 2:
The boosting element performs voltage boosting in advance before the display needs to operate at high definition. By pre-boosting the voltage using the holding element and switching element, the driver IC chip does not need to continuously supply high current, thereby reducing energy consumption while maintaining display quality
2Use of energy by moving object
If low-voltage amplitude driving method is adopted to reduce power consumption, then energy consumption is reduced, but suitable liquid crystal material is not yet developed
Solution Approach 1:
The pixel circuit acts as an intermediary between the low-voltage driver IC chip and the liquid crystal display. The boosting element in the pixel circuit amplifies the low-voltage signal to the required voltage level for the liquid crystal material, allowing the use of low-power drivers without compromising display performance or material compatibility
Solution Approach 2:
The invention changes the voltage parameter dynamically within the pixel circuit. The boosting element transforms the low-voltage input signal into a higher-voltage output signal that is suitable for driving the liquid crystal display, thereby enabling low-power operation while maintaining compatibility with existing liquid crystal materials
3Use of energy by moving object
If amplifier within pixel using low-temperature-polysilicon element is implemented, then energy consumption is reduced, but characteristic variation is wide and amplification characteristic is insufficient
Solution Approach 1:
The amplification function is extracted from the pixel circuit and implemented separately through the boosting element. This separation allows the pixel circuit to maintain simple structure with low-temperature-polysilicon elements for energy efficiency, while the boosting element provides the necessary amplification characteristic reliability through dedicated circuit design
Solution Approach 2:
Instead of using complex amplifiers within each pixel, the invention uses a simplified copying approach where the boosting element replicates and amplifies the signal locally in the pixel circuit. This copying method reduces energy consumption by avoiding complex amplification circuits while maintaining sufficient amplification characteristics through careful circuit design
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces energy consumption of the driver IC chip while maintaining high-definition display quality by effectively boosting the voltage to sufficient levels for the liquid crystal layer, extending battery life in portable devices.
Implementation Method 1
each comprising a display element LQ and two capacitive elements C1, C2 connected in series, and a boost control circuit to boost an electric potential of the capacitive element series circuit
Data Source
AI summary
According to one embodiment, a display device has a display area and pixels forming a matrix pattern. Each of the pixels has a display element and a capacitive element series circuit, and a capacitive element series circuit includes a first capacitive element and a second capacitive element. Some switches in a boost control circuit are controlled by a gate signal during one pulse period of an input source signal at least two times. The switches include, a switch being opening and/or closing in a first half of the pulse period, and a switch being closing and/or opening in a second half of the pulse period.